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Research Update: Efficacy of mechanical and chemical preseason control of herbicide-resistant Italian ryegrass

Reposted from the UCANR Sacramento Valley Field Crops blog   Summary Note Mechanical cultivation is a useful tool in controlling herbicide-resistant Italian ryegrass individuals in a rainfed wheat system but is only about half as effective as...

Posted on Wednesday, October 9, 2019 at 8:52 AM

Wildfire preparedness bill puts UC research to work

Steve Quarles and Yana Valachovic examined houses in Paradise after the devastating 2018 Camp Fire. Quarles holds up a vent screen that may have allowed embers to enter the house. Photo by Yana Valachovic

Last week, Governor Gavin Newsom signed a series of bills aimed at improving California's wildfire prevention, mitigation and response efforts.  AB 38, a bill aimed at reducing wildfire damage to communities, incorporates University of California research to help protect California's existing housing.

“Prior to AB 38, the State's wildfire building policy focus was centered around guiding construction standards for new homes and major remodels,” said Yana Valachovic, UC Cooperative Extension forest advisor for Humboldt and Del Norte counties. “How do we help incentivize homeowners to upgrade and retrofit the 10 million or more existing homes in California to help them become more resilient to wildfire? AB 38 is an attempt to start that important work and to protect Californians.”

Heat from vegetation burning close to the structure can break a window. Photo by Yana Valachovic
After wildfire passes through a community, many are left wondering why one house survives while another nearby burned to the ground. Research by UC Agriculture and Natural Resources scientists shows that building material choices, design and installation options, and maintenance can improve the odds that a house will survive a wildfire. 

AB 38, introduced by Assemblymember Jim Wood (D-Santa Rosa) provides mechanisms to develop best practices for community-wide resilience against wildfires through “home hardening,” defensible space and other measures based on UC ANR research. This bill is especially important to Wood because wildfires in 2017 destroyed lives and hundreds of homes in his district and because of his work as a forensic dentist following the Santa Rosa and Paradise wildfires.

“AB 38 was a huge effort by many partners as we sought the best policy solutions to address what is today one of our state's biggest challenges,” said Assemblymember Wood. “I could not have accomplished it without the support and guidance of the people at UC Cooperative Extension Humboldt-Del Norte, especially Dr. Steve Quarles and Yana Valachovic. Their expertise proved invaluable as we worked through this process.”

Studies conducted by Steve Quarles, emeritus UC Cooperative Extension advisor, and his continued work at the Insurance Institute for Business and Home Safety have identified building materials and designs that are more resistant to flying embers from wildfires. Embers are small, fiery pieces of plants, trees or buildings that are light enough to be carried on the wind and can rapidly spread wildfire when they blow ahead of the main fire, starting new fires on or in homes.

Evaluating the homes lost in wildfires that ravaged Paradise, Redding and Santa Rosa have also informed Valachovic and Quarles' recommendations.

Hardening a home to withstand wildland fire exposure does not have to be costly, but it does require an understanding of the exposures the home will experience when threatened by a wildfire. 

Their recommended best practices for hardening homes against wildfire can be found in UC ANR Publication 8393 “Home Survival in Wildfire-Prone Areas: Building Materials and Design,” which can be downloaded for free. More information is also at the ANR Fire website https://ucanr.edu/fire.  

Vegetation and combustible mulch around this house were ignited by embers. This ignition provided sufficient heat to break the first window pane. Photo by Yana Valachovic
Posted on Tuesday, October 8, 2019 at 1:54 PM

Giant tumbleweeds eat Victorville

Commandos from Cannon Air Force Base, N.M., clear tumbleweeds from a residential area in Clovis, N.M., 2014. U.S. Air Force/Senior Airman Ericka Engblom

A new species of gigantic tumbleweed once predicted to go extinct is not only here to stay -- it's likely to expand its territory. The species, Salsola ryanii, is significantly larger than either of its parent plants, which can grow up to 6 feet tall. A...

Commandos from Cannon Air Force Base, N.M., clear tumbleweeds from a residential area in Clovis, N.M., 2014. U.S. Air Force/Senior Airman Ericka Engblom
Commandos from Cannon Air Force Base, N.M., clear tumbleweeds from a residential area in Clovis, N.M., 2014. U.S. Air Force/Senior Airman Ericka Engblom

Commandos from Cannon Air Force Base, N.M., clear tumbleweeds from a residential area in Clovis, N.M., 2014. U.S. Air Force/Senior Airman Ericka Engblom

Posted on Sunday, October 6, 2019 at 7:00 AM

Steve Fennimore Receives Fulbright Scholar Award to Work in Uruguay on Weed Management in Organic Vegetable Production

Steve Fennimore, UC Davis, will travel to INIA Las Brujas in Uruguay for a Fulbright Project on weed management.

The U.S. Department of State and the J. William Fulbright Foreign Scholarship Board are pleased to announce that Steven Fennimore of the University of California, Davis, has received a Fulbright U.S. Scholar Program award to work in Uruguay in...

Posted on Thursday, October 3, 2019 at 2:56 PM

Summer Annual Weeds

As the summer heat is finally nearing its end, and its officially fall on the calendar, there unfortunately is a new crop of weeds flowering right now. Some of our summer annuls have started to go to seed, others are just about ready, and others are...

Posted on Monday, September 30, 2019 at 4:33 PM

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